Document dGLoEOBBXD9d0qpQgQ38O8p9

FILE NAME: &'ZZ&' DATE: : DOC#: &' DOCUMENT DESCRIPTION:dWZt^ 7- ) ,I,':'1,110MillmellHIH11111 1,11*111:II!ZIITLIA,1,1,1g11111Y111111,11,1Halonoll'i llil,, Medical Division, The B. F. Goodrich Co., Akron, Ohio WITH SAFETY RESPIRATORS HD GAS MASKS it. by the U. S. Bureau of Mines. A somewhat in excess of his breath- 'or commercially available type of this ing requirements. This means that Figure 2--Hose mask blower (s 1913). a- device is shown in Fig. 2. at all times excessive air should be 3. Compressed air (air line) flowing through the exhalation FEATURE Respirators. See Table 3. valve or about the periphery of the This is probably the most com- face piece. These devices are termed 'or monly used Supplied Air Respira- Type C Supplied Air Respirators -es tor. An illustration of it is shown by the U. S. Bureau of Mines. They in Fig. 3. It consists of a face- are approved for various lengths ill piece covering which may be of of hose up to a maximum of 250 ge either the full or half mask type, feet. It is obvious, of course, that h- a high pressure air supply system, the air supply to this device must of a short hose connecting the face receive special attention. It is the nd piece to the air supply, and a de- responsibility of the user rather an tachable coupling with a suitable than the manufacturer or the de- :he reducing valve. These devices are vice to provide a proper air supply. ed intended for non-emergency use The Bureau of Mines approval re- in- and should not be used under any quires that no pressure in excess ni- circumstances in atmospheres which of 25 lbs. per sq. inch gauge be used In- may be immediately dangerous to on these devices. Most of the manu- ter life. They will give protection facturers of this type of respirator -ge against all of the various atmos- provide a small activated carbon tat pheric contaminants. Their proper filter in the air supply line near apt operation depends upon providing the detachable coupling. The pur- as an adequate supply of high pres- pose of this is to remove small ors sure air to the wearer in amounts quantities of (To page 30) This is the second of a consecutive series of three major articles dealing with Respiratory Protection. The third feature of the series will appear in the Febru. cry 1949 issue of SAFETY ENGINEERING. .val 29 31 33 34 35 35 38 .tries. Table 2 Hose Mask without Blower Name of Respirator I. Davis air-line mask 2. Bullard Simplex hose mask Approval Number 1913 1916 Table 3 Airline Respirators Name of Respirator I. M.S.A. air-line respirator 2. Willson air-line respirator (GA, GB, GC) 3. Casco direct air mask (#602) Approval Number 1909 1909A 1912 1917 Date of Approval March 10, 1939 October 14, 1939 Date of Approval July 15, 1938 May 19,, 1947 Oct. 7, 1938 Aug. 17, 1940 Figure 3--Type C supplied air respirator (x 1909). N G FOR JANUARY, 1949 21 1:11 111 1 11 01111 I qil 11 11111111 1111111 11111 1 1 11111111111111111111 1111111111111 ,,, 1,11,1,11,1,1,,,, 0 It le -e V .e is 'S. m al le'ne .ce its eh reed tte is :- or ufOsere or enat the ion na- deimses, ved 2% of vice de,unt Pe- ins of cted I NG rINCIAP11111 0:111!IIIH,111111111'911111'1,1111IILJIltl'i'll,',,wHrlH1,'110111:1:H'Ill11' 1ha11111 H'111'114111hHHIllilZ,,',,Ilr 111'11111111LIKIIHHIIIIIIIIIII11111,11 to replace the canister at the first against all gases, including carbon signs of the passage of the contami- monoxide, and limited protection nated gas or vapor into the face against smoke. See Table 6. piece as evidenced by eye or respi- These gas masks are now termed ratory irritation or odor. A supply the Universal Type (see Fig. 6). of fresh canisters should be at all The canister consists of various times available for replacement sorbents arranged in layers to pro- purposes. Where protection against vide the maximum amount of pro- only a specific gas or gases is de- tection to the wearer against all sired this is the mask to be chosen. toxic gases and vapors. Inasmuch as It is shown in Fig. 5. carbon monoxide possesses no warn- 2. Those intended for protection ing properties, a small timing de- Table 5 Gas Masks for Specific Gases Name of Mask Approval Number Type A: Acid Gas Masks a. Hydrocyanic Acid (Canister Color: White with Green Stripe) I. M.S.A. hydrocyanic acid gas mask. 1413 (regular-size canister) 1414 (super-size canister) 2. Davis hydrocyanic acid gas mask . 1424 3. Willson hydrocyanic acid gas mask' 1428 4. Bullard hydrocyanic acid gas mask. 1431 Date of Approval Dee. 9, 1933 Dec. 9, 1933 Dec. 11, 1939 Aug. 30, 1940 Feb. 10, 1941 An extension of approval 1428 was issued May 20, 1947 to E. D. Bullard Co. b. Chlorine Gas (Canister Color: White with Yellow Stripe) I. Acme chlorine gas mask 1421 2. M.S.A. chlorine gas mask 1422 3. Willson chlorine gas mask' 1426 4. Davis chlorine gas mask 1427 5. Bullard chlorine gas mask 1430 April 21, May 26, March 8, June 26, Feb. 10, 1939 1939 1940 1940 1941 An extension of approval 1426 was issued May 20, 1947 to E. D. Bullard Co. Type B: Organic Vapor Mask (Canister I. M.S.A. organic vapor mask 2. Davis organic vapor mask 3. Acme organic vapor mask 4. Bullard organic vapor mask 5. Willson organic vapor mask' 6. Willson organic vapor mask' 7. M.S.A. organic vapor mask Color: Black) 1415 1417 1418 1419 1423 1437 (large-size canister) 1441 (super-size canister) July 28, 936 May 3, 938 May 13, 938 July 15, 938 Oct. 6, 939 Aug. 5, 944 Aug. 2, 946 An extension of approval 1423 was issued May 20, I 947 to E. D. Bullard Co. An extension of approval 1437 was issued May 20, I 947 to E. D. Bullard Co. Type AB: Acid Gas and Organic Vapor Masks (Canister Color: Yellow) a. Acid Gas and Organic Vapor I. M.S.A. acid gas & organic vapor 1409 2. Davis acid gas & organic vapor 1411 b. Hydrogen Sulfide and Petroleum Vapor I. M.S.A. hydrogen sulfide & petro- leum vapor 1410 2. M.S.A. hydrogen sulfide & petro- leum vapor 1412 3. M.S.A. hydrogen sulfide & petro- leum vapor 1416 14I6A Type C: Ammonia Gas Masks (Canister Color: Green) I. M.S.A. ammonia gas mask 1401 2. M.S.A. ammonia gas mask ... 1404 3. M.S.A. ammonia gas mask 1406 4. Davis ammonia gas mask' ' 1408 5. Acme ammonia gas mask . . 1420 6. Willson ammonia gas mask'.... 1425 7. Bullard ammonia gas mask . 1429 8. Willson ammonia gas mask (large canister) 9. M.5.A. ammonia gas mask (super- 1439 size GMD canister) ..... 1442 Jan. 23, Jan. 19, July 16, Sept. 14, June 16, July I, April 10, March 10, Feb. 14, Dec. 19, March 25, Dec. 20, Feb. 10, Sept. 22, Aug. 29, 1930 1931 1930 1931 1937 1937 1920 1926 1928 1928 1939 1939 1941 1911 1946 An extension of approval 1401 was issued June 23, 1927 to American-La France & Foamite Industries, Inc. Originally issued to Bullard-Davis, Inc., later transferred to Davis Emergency Equipment Co., Inc. An extension of approval 1408 was issued Nov. 18, 1930 to American-La France & Foamite Industries, Inc. An extension of approval 1406 was issued May 17, 1938 to B. F. McDonald Co. An extension of approval 1406 was issued Feb. 20, 1946 to American-La France & Foamite, Inc. An extension of approval 1425 was issued May 20, 1947 to E. D. Bullard Co. An extension of approval 1438 was issued May 20, 1947 to E. D. Bullard Co. vice is incorporated in masks of this type to enable the wearer to determine the time for canister replacement. These canisters are ordinarily designed for two hours of normal usage. This time, of course, may be increased or decreased depending upon the conditions under which it is worn and the volume of air which passes through it. They are approved for a maximum concentration of 2% by volume of all of the contaminants with the exception of ammonia for which the maximum limit is 3%. These canisters will also afford respiratory protection against smoke from ordinary fires and limited protection against dusts, fumes, and mists. They do not, however, afford adequate pro- Fig. 5--Industrial gas mask ( e 1423) designed for protection against a specific type of vapor. Figure 6--A universal gas mask (*1405). Note timing device immediately above the canister. FOR JANUARY, 1949 31 '1111M1'11111 H11111r1 1111111 111HII 111HI IIL11111111111111111111111 I I I IHI LI I N11111114111M1111'111111114111111,1,11 11111111111111H11 1 1 1,111'111111H11111111111111 11111111111'1111w